<h4>Tool</h4><table border="0"><tr><td valign="top"><b>Name</b></td><td valign="top">Convergence Index (Search Radius)</td></tr><tr><td valign="top"><b>ID</b></td><td valign="top">2</td></tr><tr><td valign="top"><b>Author</b></td><td valign="top">O.Conrad (c) 2003</td></tr><tr><td valign="top"><b>Specification</b></td><td valign="top">grid</td></tr></table><hr><h4>Description</h4>Reference:
Koethe, R. & Lehmeier, F. (1996): SARA - System zur Automatischen Relief-Analyse. User Manual, 2. Edition [Dept. of Geography, University of Goettingen, unpublished]

<hr><h4>Parameters</h4><table border="1" width="100%" valign="top" cellpadding="5" rules="all"><tr><th>Name</th><th>Type</th><th>Identifier</th><th>Description</th><th>Constraints</th></tr>
<tr><th colspan="5">Input</th></tr><tr><td>Elevation </td><td>Grid (input)</td><td>ELEVATION</td><td></td><td></td></tr><tr><th colspan="5">Output</th></tr><tr><td>Convergence Index</td><td>Grid (output)</td><td>CONVERGENCE</td><td></td><td></td></tr><tr><th colspan="5">Options</th></tr><tr><td>Radius [Cells]</td><td>Floating point</td><td>RADIUS</td><td></td><td>Minimum: 1.000000
Default: 10.000000</td></tr><tr><td>Weighting</td><td>Parameters</td><td>WEIGHTING</td><td></td><td>4 Parameters:
- 1. Available Choices:
[0] no distance weighting
[1] inverse distance to a power
[2] exponential
[3] gaussian weighting
Default: 0
- 2. Minimum: 0.000000
Default: 1.000000
- 3. Default: 1
- 4. Minimum: 0.000000
Default: 1.000000
</td></tr><tr><td>Gradient</td><td>Boolean</td><td>SLOPE</td><td></td><td>Default: 0</td></tr><tr><td>Difference</td><td>Choice</td><td>DIFFERENCE</td><td></td><td>Available Choices:
[0] direction to the center cell
[1] center cell's aspect direction
Default: 0</td></tr></table>